Porsche Cayenne Owner's Manual page 306

Warning!
Risk of accident.
f The collapsible spare wheel must be used only
over short distances in cases of emergency.
For safety reasons, replace the tires before
the wear indicators appear (webs in the tire
grooves, 1/16 in. (1.6 mm) high).
f Never deactivate the Porsche Stability
Management (PSM) system.
f Avoid hard acceleration and high cornering
speeds.
The maximum permitted speed is 50 mph
(80 km/h) and must not be exceeded
because of altered driving characteristics and
for reasons of wear.
The tread depth of the spare wheel is subject
to the same laws as the original tires.
f Do not use a collapsible spare wheel from a
different vehicle type.
f Do not mount the collapsible spare wheel from
your car on a different vehicle.
f Only fit one collapsible spare wheel on the
vehicle at a time.
f On vehicles with air suspension, use the tire fil-
ling connection A only to inflate the collapsible
spare wheel.
f To avoid damage, do not use automatic car
washes when the spare wheel is installed.
306
Minor Repairs
After using the collapsible spare wheel
f Release air by unscrewing the valve insert.
Notes on operation
The tire will revert to its original shape only after
several hours. Only then can it be stowed in the
spare wheel recess in the luggage compartment.
There is a plastic sheet in the tool box to store the
damaged wheel.
Maintenance Note
The collapsible spare wheel must be repaired only
by the manufacturer.
f Please consult your authorized Porsche dealer
if the collapsible spare wheel is defective.
Checking tire pressure with a pressure
gage
1. Remove the valve stem cap from the tire.
2. Press the pressure gage onto the valve stem.
Note on operation
f Do not press too hard or force the valve stem
sideways, or air will escape.
If the sound of air escaping from the tire is
heard, reposition the pressure gage.
3. Read the tire pressure on the gage stem and
compare it to the permissible tire pressure.
This information can be found on the tire pres-
sure plate in the left door aperture.
Please see the chapter "TIRE PRESSURES,
COLD (68 °F/20 °C)" on Page 354.
4. Remove the pressure gage.